Losing weight on "The Biggest Loser" isn't a guaranteed end to the battle, and the new series "The Big Fat Truth" is going to explore why. With many former contestants putting hard-fought pounds ...

The OG winner isn't the only one from the show with this problem. There have been multiple contestants from the series' 18 seasons who have re-gained the weight, with one recent study suggesting ...

RELATED: 'Biggest Loser' winner Ali Vincent reveals weight gain, says 'I feel like a failure' Previous research has shown that people who lose weight show a drop in their resting metabolic rate ...

PEOPLE spoke to Neil about his infamous 17-lb. weight gain, life at home and romance. –Cynthia Wang Most will remember you as the guy who gained 17 lbs. in one week to oust Jez or Isabeau from ...